IOVSvc: Fix thread-safety checker warnings.

Fix some new thread-safety checker warnings.

added alsoTargeting:22.0 label

This merge request affects 1 package:

• Control/IOVSvc

This merge request affects 3 files:

• Control/IOVSvc/src/CBNode.h
• Control/IOVSvc/src/CBTree.cxx
• Control/IOVSvc/src/CBTree.h

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash 12b43c8b)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 59380]

The changes are fine and there are no CI issues. Approving.

Jason (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit b1cb7a2b

added sweep:done label

picked the changes into the branch cherry-pick-b1cb7a2b976-22.0 with commit fd75f201

mentioned in commit fd75f201

Sweep summary
successful:

• 22.0

(see https://aiatlas154.cern.ch/jenkins/job/auto_git_sweeps/3161/console for details)

mentioned in merge request !57052 (merged)

mentioned in commit d6a5a742